Author Topic: tale #69  (Read 333 times)

richardHaw

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tale #69
« on: April 07, 2019, 16:53:28 »
https://imaging.nikon.com/history/story/0069/index.htm?fbclid=IwAR0py-HQfFgtaczNzc6Cd71T2kVw7dXW6Al9MVNvEUhGhuqzvtl-Fo-YSag

shared by mr Sato himself on our FB group.  :o :o :o

that's where I pester him to make lenses that I like such as an AF Sonnar for the Z  ::)

chambeshi

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Re: tale #69
« Reply #1 on: April 07, 2019, 18:51:20 »
Great. Thanks very much  ;D ;D

Glad to learn Sato San is still doing what he excels at!
D850, Z7, 20 f4 AI 28 f2.8AIS 45 f2.8AIP 55mm 2.8AIS+60 f2.8G Micro 58 f1.4G, 85 f1.4D, 105 f2.5AIS, 400 f2.8E VRII 300 f4E PF 500 f5.6E P, 18-35 G, 24-70 f4S, 70-180 Micro f4-5.6D 70-200 f2.8E FL, Zeiss Distagons -15 f2.8, 21 f2.8

Birna Rørslett

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Re: tale #69
« Reply #2 on: April 07, 2019, 19:15:41 »
Fortunately, it's possible to decouple the mechanism that closes down the aperture as the magnification increases. This avoids the problem of being stuck with f/32 nominal at 1:1 and the quality loss that the small opening entails. In order to be able to set aperture in this case, the lens has to be CPU-modified ('chipped') with the CPU in G mode. One can still use the ring flash feature.

I have a Medical 120 modified in this manner and I believe there are a couple others floating around as I have delivered CPUs for several projects. Erik [Lund] might have one too.


Roland Vink

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Re: tale #69
« Reply #3 on: April 07, 2019, 23:35:39 »
Thank you, that is very interesting. The AI 200/4 micro from the same time would seem to be a similar concept - a telephoto lens for closeups with inner focusing - but the optical designs are quite different.